SCALANCE W1750D UI
Configuration Manual, 02/2018, C79000-G8976-C451-02
101
VLAN Configuration
9
VLAN configuration is required for networks with more devices and broadcast traffic on a
WLAN SSID or wired profile. Based on the network type and its requirements, you can
configure the VLANs for a WLAN SSID or wired port profile.
For more information on VLAN configuration for a WLAN SSID and wired port profile, see
Configuring VLAN Settings for a WLAN SSID Profile (Page 117) and Configuring VLAN for a
Wired Profile (Page 149) , respectively.
9.1
VLAN Pooling
In a single AP cluster, a large number of clients can be assigned to the same VLAN. Using
the same VLAN for multiple clients can lead to a high level of broadcasts in the same subnet.
To manage the broadcast traffic, you can partition the network into different subnets and use
L3-mobility between those subnets when clients roam. However, if a large number of clients
need to be in the same subnet, you can configure VLAN pooling, in which each client is
randomly assigned a VLAN from a pool of VLANs on the same SSID. Thus, VLAN pooling
allows automatic partitioning of a single broadcast domain of clients into multiple VLANs.
9.2
Uplink VLAN Monitoring and Detection on Upstream Devices
If a client connects to an SSID or a wired interface with VLAN that is not allowed on the
upstream device, the client will not be assigned an IP address and thus cannot connect to
the Internet. In such scenario, the SCALANCE W UI now displays the following alert
message:
Figure 9-1
Uplink VLAN Detection
To resolve this issue, ensure that there is no mismatch in the VLAN configuration.